Hydrogen peroxide and saline nutrient solution in hydroponic zucchini culture

Saline water has been used in irrigation due to the limited availability of fresh water, especially arid and semi-arid regions. However, use this type can affect crop growth development. Studies have tested chemical conditioners minimize negative effects salinity on plants. In scenario, present study examined role hydrogen peroxide mitigating salt stress zucchini plants grown a hydroponic system. The was carried out greenhouse Pombal - PB, Brazil. NFT (nutrient film technique) system employed. A randomized complete experimental design set up with 4 × factorial arrangement consisting four levels electrical conductivity nutrient solution (ECns: 2.1 [control], 3.6, 5.1, 6.6 dS m-1) concentrations (H2O2: 0, 20, 40, 60 μM), three replicates. Foliar spraying H2O2 at 40 μM associated m-1 increased stem diameter root length, respectively, 47 days after transplanting. ECns higher than m-1, application intensified stress, reducing length. Nutrient above reduce photosynthetic pigments; number leaves; leaf area; length main branch; dry biomass stems, leaves, roots Chlorophyll b carotenoid contents are variables most sensitive changes levels.